of Sugar with the Alkalies and Metallic Oxides, 153 



and filtered ; and from which solutions carefully evaporated 

 under 180° (the compound being insoluble at higher tempe- 

 ratures), and then dried at 212°, 100 grs. give from 22 \ to 

 23£ per cent, of lime. Now if, with Berzelius, we consider 

 sugar dried at 212° as C le H 10 O 1Q + HO =171, from 23 per 



cent, we shall have 51*07 as the number for lime, too small for 

 two proportions ; but should the lime be as a hydrate, instead 

 of 23 we shall have 30*4, leaving the sugar 69*6 per cent.; or 

 for 171, 56*7 as the number for lime, equal to two proportions, 

 A better way to obtain the composition, on account of the diffi- 

 culty of preventing the formation of a little carbonate, is to 

 add alcohol to the filtered solutions, and then wash the curdy 

 precipitate with proof spirit ; this precipitate when dried at 

 212° gave 22*65 per cent, of lime = 29*93 hydrate, which 

 gives 55*27 as the proportion to one of sugar; hence 



Saccharate of lime (C 12 H 10 O 10 + HO + 2CaO + 2HO) 

 = 24-5. 



If a solution of the saccharate of lime be added to hydrated 

 deutoxide of copper, we obtain a bright blue solution, much 

 resembling the ammoniuret; this evaporated under 160° leaves 

 a crystalline substance permanent in the air, which dried at 

 212° has the following composition : 10 grains, after account- 

 ing for a little carbonic acid absorbed during evaporation, 



gave Lime 1*63 = 2*154 hydrate. 



Deutoxide 2*33 = 2*586 do. 



4*74 

 leaving 5*26 for the sugar, but which to be in proportion to 

 the lime should be 4*98 ; the *28 may probably have arisen 

 from a little unexpelled water : thus we may consider the 

 above as 



1 Sugar = 171 = 57*2 



2 CaO + 2HO = 74 = 22*15 

 CuOHHO = 89 = 26*65 



334 100* 



The relations of this calcareo-saccharate to oxygen are 

 rather singular; if we heat a little of the solution to 160°, a 

 flaky blue precipitate is separated, that entirely redissolves 

 again on cooling, which could not be the case had any prot- 

 oxide been formed. This being apparently at variance with 

 some of the results obtained by M. Becquerel in his experi- 

 ments on the varieties of sugar (in which he shows that hydrated 

 oxide of copper agitated with sugar and an alkali is dissolved, 

 but precipitated again as protoxide when boiled,) I was in- 



Third Series, Vol. 11. No. 66. ^.1837. X 



